21 of the most iconic photos ever taken. The image of a napalm scarred little girl running from her burning village in Vietnam is one of the most well known photographs in the world. Kim Phuc, the girl featured in the image, is now receiving free laser surgery to cover her scars, 40 years after that terrible day.
1 Oxygen: Specialized nerve cells within the aorta and carotid arteries called peripheral chemoreceptors monitor the oxygen concentration of the blood and feed back on the respiratory centers. 2  If the oxygen concentration in the blood decreases, they tell the respiratory centers to increase the rate and depth of breathing. This mechanism prevents damage to the lungs that would be caused by over-inflation. 2  Signals from higher brain centers: Nerve cells in the hypothalamus and cortex also influence the activity of the respiratory centers. 3  During pain or strong emotions, the hypothalamus will tell the respiratory centers to speed up.
types of neurons nerve cells the human body is made up of trillions of cells cells of the nervous system called nerve cells or neurons are specialized to carry messages through an electrochemical process the human brain has approximately 100 billion neuronsto learn how neurons carry messages read about the action potentialhe human body is made up of trillions of cells cells of the nervous system called nerve cells or neurons are specialized to carry messages through an electrochemical process